Lecture 14:

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10 Terms

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Circadian Rhythms
Cycles that last approximately 24 hours and are endogenously generated, influencing processes like body temperature and hormone levels.
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Entrainment
The synchronization of an organism's internal clock to external environmental cues, primarily light.
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Free-Running
The internal clock operating without external cues.
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Zeitgeber
External signals like light that synchronize the circadian clock.
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Period (Tau)
The time for one complete cycle of a rhythm.
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Amplitude
The difference between peak and mean levels of a rhythmic output.
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Cyanobacteria
A model organism for microbial clocks, specifically Synechococcus elongatus where a circadian clock was first identified.
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Vibrio fischeri
A bioluminescent bacterium exhibiting substrate-specific metabolic efficiency with distinct metabolic strategies under varying conditions.
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Microbiota and Host Circadian Clock
Gut microbiota exhibit circadian rhythms influenced by the host's clock and external cues like feeding schedules.
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Melatonin
A hormone secreted by the pineal gland that regulates sleep and circadian rhythms, influencing bacterial behaviors.